Re: How to get the number of VFs assigned to the guests in XEN

From: Konrad Rzeszutek Wilk
Date: Wed Aug 20 2014 - 18:29:37 EST


On Wed, Aug 20, 2014 at 04:33:29PM +0530, Sreekanth Reddy wrote:
> HI,
>
>
>
> For SRIOV support, currently in the KVM environment, mpt3sas driver can use
> the API pci_vfs_assigned() to know the number of VFs that are currently
> assigned to the running VMs. So that during the PF driver unload time, if
> the return value of this API is greater than zero the our driver won't call
> the pci_disable_sriov() to disable the VFs.
>
>
>
> Now for the same purpose in XEN environment, is there any API similar to
> pci_vfs_assigned() which the low lever device driver can use to know 'the
> number of VFs that are currently assigned to the running VMs'. In XEN
> environment this API pci_vfs_assigned() will return always zero even though
> VFs are assigned to the running VMs.

Odd. It should return the same value. Are the devices binded to pci-back?

>
>
>
> Regards,
>
> Sreekanth
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